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Excessive brightness and the resulting light pollution have taken away space from the value of darkness, the meaning that the perception of darkness can have. There are many harms at the psychological, physical, scientific and cultural levels that light pollution can cause. Two clinical vignettes specifically illustrate how significant in emotional and relational terms an excess of ambient brightness or, conversely, the irruption of darkness into the analysis room can be.
KEY WORDS: Darkness, light, lighting, invisible, visual perception and abstention.